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    Method and device for MAC layer feedback in a packet communication system
    3.
    发明授权
    Method and device for MAC layer feedback in a packet communication system 失效
    分组通信系统中MAC层反馈的方法和设备

    公开(公告)号：US06975611B1

    公开(公告)日：2005-12-13

    申请号：US09517907

    申请日：2000-03-03

    申请人： Krishna Balachandran ,  Subrahmanyam Dravida ,  Richard P. Ejzak ,  Sanjiv Nanda ,  Shiv M. Seth ,  Stanley Vitebsky

    发明人： Krishna Balachandran ,  Subrahmanyam Dravida ,  Richard P. Ejzak ,  Sanjiv Nanda ,  Shiv M. Seth ,  Stanley Vitebsky

    IPC分类号： H04B7/212 ,  H04B7/26

    CPC分类号： H04B7/2612

    摘要： A method and communication device for media access control feedback over a packet channel divided in channel time slots is provided. The channel time slots are divided into sub-channel time slots. A packet channel feedback field associated with each sub-channel time slot is defined. Acknowledgments are indicated using the packet channel feedback field. An active mobile identity associated with an active mobile station may be assigned which would then be included in the packet channel feedback field. A plurality of active mobile identities may be assigned and some of the active mobile identities may be reserved for special functions. The assigned active mobile identity is used, among other things, to identify an active mobile station to receive packet data signals. The active mobility identity is invalidated after one transaction of packet data signals or invalidated after a short number of such transactions. One or more of the assigned active mobile identities may be used to indicate a time slot assignment for the active mobile station. A sub-channel feedback field in the packet channel feedback field is used to indicate acknowledgments. A sub-channel assignment field in the packet channel feedback field is used to indicate time slot assignments. The sub-channel assignment field is substantially independent of the sub-channel feedback field.

    摘要翻译： 提供了一种用于通过以信道时隙划分的分组信道的媒体访问控制反馈的方法和通信设备。 信道时隙被划分为子信道时隙。 定义与每个子信道时隙相关联的分组信道反馈字段。 使用分组信道反馈字段指示致谢。 可以分配与活动移动台相关联的活动移动身份，然后将其包括在分组信道反馈字段中。 可以分配多个活动移动身份，并且可以为特定功能保留一些活动移动身份。 除了别的以外，使用所分配的活动移动身份以识别用于接收分组数据信号的活动移动台。 主动移动身份在分组数据信号的一次交易之后无效，或者在短时间的这种交易之后无效。 分配的活动移动身份中的一个或多个可以用于指示活动移动台的时隙分配。 分组信道反馈字段中的子信道反馈字段用于指示确认。 分组信道反馈字段中的子信道分配字段用于指示时隙分配。 子信道分配字段基本上独立于子信道反馈字段。

    System and method for measuring channel quality information in a communication system
    5.
    发明授权
    System and method for measuring channel quality information in a communication system 失效
    用于测量通信系统中信道质量信息的系统和方法

    公开(公告)号：US06215827B1

    公开(公告)日：2001-04-10

    申请号：US09044636

    申请日：1998-03-19

    申请人： Krishna Balachandran ,  Sanjiv Nanda ,  Srinivas R. Kadaba ,  Richard P. Ejzak

    发明人： Krishna Balachandran ,  Sanjiv Nanda ,  Srinivas R. Kadaba ,  Richard P. Ejzak

    IPC分类号： H04L2302

    CPC分类号： H04L1/0015 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0026 ,  H04L1/0054 ,  H04L1/006 ,  H04L1/12 ,  H04L1/20 ,  H04W36/30 ,  H04W72/08

    摘要： A system and method to measure channel quality in terms of signal to interference plus noise ratio for the transmission of coded signals over fading channels in a communication system. A Viterbi decoder metric for the Maximum Likelihood path is used as a channel quality measure for coherent and non-coherent transmission schemes. This Euclidean distance metric is filtered in order to smooth out short term variations. The filtered or averaged metric is a reliable channel quality measure which remains consistent across different coded modulation schemes speeds. The filtered metric is mapped to the signal to interference plus noise ratio per symbol using a threshold based scheme. Use of this implicit signal to interference plus noise ratio estimate is used for the mobile assisted handoff in a cellular system, power control and data rate adaptation in the transmitter.

    摘要翻译： 一种用于在通信系统中通过衰落信道传输编码信号的信噪比加噪声比来测量信道质量的系统和方法。 用于最大似然路径的维特比解码器度量用作相干和非相干传输方案的信道质量测量。 过滤欧几里德距离度量以平滑短期变化。 滤波或平均的度量是可靠的信道质量度量，其在不同的编码调制方案速度下保持一致。 使用基于阈值的方案将经滤波的度量映射到每个符号的信号与干扰加噪声比。 使用这种隐含信号对干扰加噪声比估计用于蜂窝系统中的移动辅助切换，发射机中的功率控制和数据速率适配。

    System and method for wireless communication supporting link adaptation and incremental redundancy
    6.
    发明授权
    System and method for wireless communication supporting link adaptation and incremental redundancy 失效
    支持链路自适应和增量冗余的无线通信系统和方法

    公开(公告)号：US06895057B1

    公开(公告)日：2005-05-17

    申请号：US09431996

    申请日：1999-11-02

    申请人： Krishna Balachandran ,  Richard P. Ejzak ,  Sanjiv Nanda

    发明人： Krishna Balachandran ,  Richard P. Ejzak ,  Sanjiv Nanda

    IPC分类号： H04J3/16 ,  H04L1/00 ,  H04L1/18 ,  H04L5/16 ,  H04L27/00

    CPC分类号： H04L1/0059 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0061 ,  H04L1/0068 ,  H04L1/0072 ,  H04L1/1819 ,  H04L1/1867

    摘要： A system and method is provided for communicating in a wireless communication system which supports link adaptation or link adaptation and incremental redundancy. The invention provides link adaptation at multiple code rate by dividing fixed length RLC blocks into coded sub-blocks. CRC code may be appended to the RLC blocks for error detection. The sub-blocks are then grouped into transmission units for transmission. The number of sub-blocks in each group is varied to provide multiple code rates. Headers are used to identify the transmission units being transmitted. In the case of retransmission, the transmission units may be expressly identified through extended headers. One or more of the originally transmitted sub-blocks are dropped and replaced by the extended headers in the retransmission. Accordingly, the present invention provides for a retransmission code rate which may be different from the code rate at which the transmission units were originally transmitted.

    摘要翻译： 提供了一种在支持链路适配或链路自适应和增量冗余的无线通信系统中进行通信的系统和方法。 本发明通过将固定长度的RLC块划分成编码的子块来提供多码率的链路自适应。 CRC码可以附加到RLC块用于错误检测。 然后将这些子块分组成传输单元进行传输。 每个组中的子块的数量是变化的以提供多个代码率。 标题用于识别正在发送的传输单元。 在重传的情况下，可以通过扩展报头来明确地识别传输单元。 原始传输的子块中的一个或多个被丢弃并被重传中的扩展头替换。 因此，本发明提供了与发送单元最初发送的码率不同的重传码率。

    Method and apparatus for determining channel conditions in a communication system
    9.
    发明授权
    Method and apparatus for determining channel conditions in a communication system 失效
    用于确定通信系统中的信道状况的方法和装置

    公开(公告)号：US07020185B1

    公开(公告)日：2006-03-28

    申请号：US09724231

    申请日：2000-11-28

    申请人： Krishna Balachandran ,  Sanjiv Nanda

    发明人： Krishna Balachandran ,  Sanjiv Nanda

    IPC分类号： H04B1/38

    CPC分类号： H04W52/20 ,  H04B17/345

    摘要： One example of symbol or bit error probability estimation in a communication system using soft decision information determines soft decision metric(s) for each symbol that is received over a communication channel and employs the soft decision metric(s) to obtain an estimate of symbol or bit error probability.

    摘要翻译： 使用软判决信息的通信系统中的符号或位错误概率估计的一个例子确定通过通信信道接收的每个符号的软判决度量，并采用软判决度量来获得符号或 位错误概率。